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The diffusion of gases through liquids and allied experiments . of measurement presently to be given will depend upon thispossibility. 39 40 THE DIFFUSION OF GASES THROUGH To keep the water level at the proper height or to raise or lower it by adefinite amount, the screw pump in fig. 13 is available. This consistsessentially of a thick screw S playing into the brass tube cc, which is closedat the top by the stuffing box a compressing the ring of soft material bb.The bottom of the tube cc ends in the tubulure i, to be joined by appro-priate tubing with the corresponding tubulure i in fig. 11 a.

The diffusion of gases through liquids and allied experiments . of measurement presently to be given will depend upon thispossibility. 39 40 THE DIFFUSION OF GASES THROUGH To keep the water level at the proper height or to raise or lower it by adefinite amount, the screw pump in fig. 13 is available. This consistsessentially of a thick screw S playing into the brass tube cc, which is closedat the top by the stuffing box a compressing the ring of soft material bb.The bottom of the tube cc ends in the tubulure i, to be joined by appro-priate tubing with the corresponding tubulure i in fig. 11 a. Stock Photo
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The Reading Room / Alamy Stock Photo

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2AJBTR0

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7.1 MB (219.6 KB Compressed download)

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1363 x 1832 px | 23.1 x 31 cm | 9.1 x 12.2 inches | 150dpi

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The diffusion of gases through liquids and allied experiments . of measurement presently to be given will depend upon thispossibility. 39 40 THE DIFFUSION OF GASES THROUGH To keep the water level at the proper height or to raise or lower it by adefinite amount, the screw pump in fig. 13 is available. This consistsessentially of a thick screw S playing into the brass tube cc, which is closedat the top by the stuffing box a compressing the ring of soft material bb.The bottom of the tube cc ends in the tubulure i, to be joined by appro-priate tubing with the corresponding tubulure i in fig. 11 a. The brasstube cc, fig. 13, is quite filled with water to the exclusion of air, so that everyturn of the screw 6* raises the level ww in fig. 11 a by a definite amount.The screw5 is also provided with a graduated head (not shown), so that thewhole turns and fractions of a turn may be read off, and the ratio of thediameter of the water level in fig. 11 a and that of the screw S in fig. 13must be known. In the figure the ratio of the areas is about ten to one.. ^. Fig. 11 A.—Absolute electrometer with disk carried by tubular hydrometer of aluminum.B.—Absolute electrometer with glass U-tube for adjusting levels. It is interesting to note in passing that on sudden advance or retreat ofthe screw S an impulsive wave passes through the liquid, suddenly raisingand lowering the disk e often more than a centimeter and with considerableforce. Direct and reflected waves are recorded in this way. In many of the experiments it was found sufficient to coat the screw (hot)with an adhesive layer of resin and beeswax. A well-fitting brass screv/0.75 inch in diameter and 20 threads to the inch was used. A socket ofindurated fiber is even preferable, there being no appreciable leakage forsome time. This avoids the complication of a stuffing box, but of course it LIQUIDS AND ALLIED EXPERIMENTS. 41 will not last indefinitely. In other experiments the hose ii was branchedand led to a glass reserv

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